Fraser's own Patent Boxlock is a totally different cat than the usually encountered A&D. Not to say that Fraser's didn't use them.

The giveaway is the screw head on the side at the bottom rear of the action.
This is actually a plug to allow access to the pivot screw for the triggers.
One can't get the trigger plate on to the action with the triggers already mounted.

The ones I've been into rank as the most thoroughly well built actions I have ever seen.